Results 211 to 220 of about 10,509,509 (258)
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Cerebrospinal fluid oxygen tension at different levels of oxygenation
Respiration Physiology, 1967Abstract In normal sheep breathing air, with an arterial P O 2 of 84 mm Hg, mean cerebrospinal fluid P O 2 was 62 mm Hg. The arterial-cistemal P O 2 difference virtually disappeared during hypoxia and increased nearly linearly in hyperoxia. Possible significance and mechanism of these findings is discussed.
D.F.J. Halmagyi, D.J. Gillett
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Oxygenation alters red cell folate levels
British Journal of Haematology, 1983Summary.Folate activity is consistently higher in deoxygenated than oxygenated human blood as measured by both radioassay and Lactobacillus casei growth. Red cell, but not serum, folate levels are rapidly mutable: when fully oxygenated, the mean red cell folate level of 15 samples was 489 ng/ml; after deoxygenation the mean rose to 553 ng/ml; following
BRANDA, RF, NELSON, NL, KLAUSNER, JS
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Transcutaneous oxygen tension in selection of amputation level
The American Journal of Surgery, 1984The utility of transcutaneous oxygen tension measurements in selection of a reliable amputation level was evaluated. Measurements were made at the proposed level of amputation in 37 patients, 22 of whom underwent major limb amputation and in 15 amputation was confined to the forefoot or toes.
A, Katsamouris +5 more
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Concepts of oxygen transport at the microcirculatory level
Seminars in Radiation Oncology, 1998This article compares and contrasts the classic paradigms underlying the development of chronic and acute hypoxia in tumors. The classic theory of Thomlinson and Gray suggested that chronic hypoxia is the result of large intravascular distances.
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A Respirometer with Controllable Oxygen Levels
Transactions of the American Fisheries Society, 1974Abstract Construction details and operation of a respirometer with capabilities for controlling the oxygen level at preselected levels is described. The interaction of an oxygen sensor and electronic switch energizes an electrolysis cell which replenishes oxygen used by a test organism.
Dewey L. Tackett +2 more
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Oxygen levels in the prebiological atmosphere
Journal of Geophysical Research: Oceans, 1979A photochemical model of the early terrestrial atmosphere is used to find oxygen profiles as a function of the hydrogen and carbon monoxide outgassing rates from volcanoes and the rate of oxidation of the earth's crust. Steady state solutions for the amount of O2 in the atmosphere are possible only when the combined loss rate from all three processes ...
J. F. Kasting, S. C. Liu, T. M. Donahue
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Nature, 1986
From the time that detailed oxygen isotope records derived from foraminifera living in the constant-temperature environment of the abyssal ocean became available, there has been a discrepancy between the ice volume record that these records imply, and that derived from the altitude of dated coral terraces around the world.
J. Chappell, N. J. Shackleton
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From the time that detailed oxygen isotope records derived from foraminifera living in the constant-temperature environment of the abyssal ocean became available, there has been a discrepancy between the ice volume record that these records imply, and that derived from the altitude of dated coral terraces around the world.
J. Chappell, N. J. Shackleton
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Determining Dissolved Oxygen Levels
PRIMUS, 2010Abstract This project was used in a mathematical modeling and introduction to differential equations course for first-year college students. The students worked in two-person groups and were given three weeks to complete the project. Students were given this project three weeks into the course, after basic first order linear differential equation and ...
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Prebiotic atmospheric oxygen levels
Nature, 1981It has been argued1–2 that the early Precambrian atmosphere contained a negligible amount of oxygen and that the transition to the modern oxygen-rich atmosphere began some 2,000 Myr BP when photosynthetic oxygen produced by blue-green algae oxidized ferrous iron in solution and escaped from the ocean to the atmosphere.
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JAMA: The Journal of the American Medical Association, 1967
To the Editor:— In a recent editorial on the dangers of administering high concentrations of oxygen ( 199 : 494, 1967), no mention was made that low flow rates of oxygen are not only lifesaving, but safe. Too many deaths occur because oxygen is withheld from severely ill patients with pulmonary emphysema.
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To the Editor:— In a recent editorial on the dangers of administering high concentrations of oxygen ( 199 : 494, 1967), no mention was made that low flow rates of oxygen are not only lifesaving, but safe. Too many deaths occur because oxygen is withheld from severely ill patients with pulmonary emphysema.
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